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                            <b>1.</b>
                        
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                            <b>1.1.</b>
                        
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                            <b>1.3.</b>
                        
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                            <b>1.4.</b>
                        
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                        生态系统
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                        Action
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                            <b>2.2.</b>
                        
                        Reducer
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                            <b>2.3.</b>
                        
                        Store
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                            <b>2.4.</b>
                        
                        数据流
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                            <b>2.5.</b>
                        
                        搭配 React
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                            <b>2.6.</b>
                        
                        示例：Todo List
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                            <b>3.</b>
                        
                        高级
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                            <b>3.1.</b>
                        
                        异步 Action
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                            <b>3.2.</b>
                        
                        异步数据流
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                            <b>3.3.</b>
                        
                        Middleware
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                            <b>3.4.</b>
                        
                        搭配 React Router
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                            <b>3.5.</b>
                        
                        示例：Reddit API
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                            <b>3.6.</b>
                        
                        下一步
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                            <b>4.</b>
                        
                        技巧
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                            <b>4.1.</b>
                        
                        迁移到 Redux
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                            <b>4.2.</b>
                        
                        使用对象展开运算符
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                            <b>4.3.</b>
                        
                        减少样板代码
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                            <b>4.4.</b>
                        
                        服务端渲染
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                            <b>4.5.</b>
                        
                        编写测试
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                            <b>4.6.</b>
                        
                        计算衍生数据
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                            <b>4.7.</b>
                        
                        实现撤销重做
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                            <b>4.8.</b>
                        
                        子应用隔离
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                            <b>4.9.</b>
                        
                        组织 Reducer
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                            <b>4.9.1.</b>
                        
                        Reducer 基础概念
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                            <b>4.9.2.</b>
                        
                        Reducer 基础结构
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                            <b>4.9.3.</b>
                        
                        Reducer 逻辑拆分
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                            <b>4.9.4.</b>
                        
                        Reducer 重构示例
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                            <b>4.9.5.</b>
                        
                        `combineReducers` 用法
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                            <b>4.9.6.</b>
                        
                        `combineReducers` 进阶
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                            <b>4.9.7.</b>
                        
                        State 范式化
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                            <b>4.9.8.</b>
                        
                        管理范式化数据
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                            <b>4.9.9.</b>
                        
                        Reducer 逻辑复用
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        <li class="chapter " data-level="4.9.10" data-path="docs/recipes/reducers/ImmutableUpdatePatterns.html">
            
                
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                            <b>4.9.10.</b>
                        
                        不可变更新模式
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                            <b>4.9.11.</b>
                        
                        初始化 State
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                            <b>5.</b>
                        
                        常见问题
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                            <b>5.1.</b>
                        
                        综合
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                            <b>5.2.</b>
                        
                        Reducer
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        <li class="chapter " data-level="5.3" data-path="docs/faq/OrganizingState.html">
            
                
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                            <b>5.3.</b>
                        
                        组织 State
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                            <b>5.4.</b>
                        
                        创建 Store
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                    <a href="../../../docs/faq/Actions.html">
                
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                            <b>5.5.</b>
                        
                        Action
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                            <b>5.6.</b>
                        
                        代码结构
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                            <b>5.7.</b>
                        
                        性能
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        <li class="chapter " data-level="5.8" data-path="docs/faq/ReactRedux.html">
            
                
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                            <b>5.8.</b>
                        
                        React Redux
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        <li class="chapter " data-level="5.9" data-path="docs/faq/Miscellaneous.html">
            
                
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                            <b>5.9.</b>
                        
                        其它
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        <li class="chapter " data-level="6" data-path="docs/Troubleshooting.html">
            
                
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                            <b>6.</b>
                        
                        排错
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        <li class="chapter " data-level="7" data-path="docs/Glossary.html">
            
                
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                            <b>7.</b>
                        
                        词汇表
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        <li class="chapter " data-level="8" data-path="docs/api/index.html">
            
                
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                            <b>8.</b>
                        
                        API 文档
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            <ul class="articles">
                
    
        <li class="chapter " data-level="8.1" data-path="docs/api/createStore.html">
            
                
                    <a href="../../../docs/api/createStore.html">
                
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                            <b>8.1.</b>
                        
                        createStore
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        <li class="chapter " data-level="8.2" data-path="docs/api/Store.html">
            
                
                    <a href="../../../docs/api/Store.html">
                
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                            <b>8.2.</b>
                        
                        Store
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        <li class="chapter " data-level="8.3" data-path="docs/api/combineReducers.html">
            
                
                    <a href="../../../docs/api/combineReducers.html">
                
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                            <b>8.3.</b>
                        
                        combineReducers
                    </a>
            
            
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        <li class="chapter " data-level="8.4" data-path="docs/api/applyMiddleware.html">
            
                
                    <a href="../../../docs/api/applyMiddleware.html">
                
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                            <b>8.4.</b>
                        
                        applyMiddleware
                    </a>
            
            
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        <li class="chapter " data-level="8.5" data-path="docs/api/bindActionCreators.html">
            
                
                    <a href="../../../docs/api/bindActionCreators.html">
                
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                            <b>8.5.</b>
                        
                        bindActionCreators
                    </a>
            
            
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        <li class="chapter " data-level="8.6" data-path="docs/api/compose.html">
            
                
                    <a href="../../../docs/api/compose.html">
                
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                            <b>8.6.</b>
                        
                        compose
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            </ul>
            
        </li>
    
        <li class="chapter " data-level="9" data-path="docs/react-redux/index.html">
            
                
                    <a href="../../../docs/react-redux/index.html">
                
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                            <b>9.</b>
                        
                        react-redux 文档
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            <ul class="articles">
                
    
        <li class="chapter " data-level="9.1" data-path="docs/react-redux/api.html">
            
                
                    <a href="../../../docs/react-redux/api.html">
                
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                            <b>9.1.</b>
                        
                        API
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        <li class="chapter " data-level="9.2" data-path="docs/react-redux/troubleshooting.html">
            
                
                    <a href="../../../docs/react-redux/troubleshooting.html">
                
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                            <b>9.2.</b>
                        
                        排错
                    </a>
            
            
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                        <a id="edit-link" href="https://github.com/camsong/redux-in-chinese/tree/master/docs/recipes/reducers/BeyondCombineReducers.md" class="btn fa fa-edit pull-left">&#xA0;&#xA0;&#x5F00;&#x59CB;&#x7EA0;&#x9519;</a><h1 id="-combinereducers-%E8%BF%9B%E9%98%B6"><code>combineReducers</code> &#x8FDB;&#x9636;</h1>
<p>Redux &#x5F15;&#x5165;&#x4E86;&#x975E;&#x5E38;&#x5B9E;&#x7528;&#x7684; <code>combineReducers</code> &#x5DE5;&#x5177;&#x51FD;&#x6570;&#xFF0C;&#x4F46;&#x6211;&#x4EEC;&#x5374;&#x7C97;&#x66B4;&#x5730;&#x5C06;&#x5B83;&#x9650;&#x5236;&#x4E8E;&#x5355;&#x4E00;&#x7684;&#x5E94;&#x7528;&#x573A;&#x666F;&#xFF1A;&#x628A;&#x4E0D;&#x540C;&#x7247;&#x6BB5;&#x7684; state &#x7684;&#x66F4;&#x65B0;&#x5DE5;&#x4F5C;&#x59D4;&#x6258;&#x7ED9;&#x4E00;&#x4E2A;&#x7279;&#x5B9A;&#x7684; reducer&#xFF0C;&#x4EE5;&#x6B64;&#x66F4;&#x65B0;&#x7531;&#x666E;&#x901A;&#x7684; JavaScript &#x5BF9;&#x8C61;&#x6784;&#x6210;&#x7684; state &#x6811;&#x3002;&#x5B83;&#x4E0D;&#x89E3;&#x51B3; Immutable.js Maps &#x6240;&#x6784;&#x5EFA;&#x7684; state tree&#xFF0C;&#x4E5F;&#x4E0D;&#x4F1A;&#x628A;&#x5176;&#x4F59;&#x90E8;&#x5206;&#x7684; state &#x4F5C;&#x4E3A;&#x989D;&#x5916;&#x53C2;&#x6570;&#x4F20;&#x9012;&#x7ED9; reducer &#x6216;&#x8005;&#x6392;&#x5217; reducer &#x7684;&#x8C03;&#x7528;&#x987A;&#x5E8F;&#xFF0C;&#x5B83;&#x540C;&#x6837;&#x4E0D;&#x5173;&#x5FC3; reducer &#x5982;&#x4F55;&#x5DE5;&#x4F5C;&#x3002;</p>
<p>&#x4E8E;&#x662F;&#x4E00;&#x4E2A;&#x5E38;&#x89C1;&#x95EE;&#x9898;&#x51FA;&#x73B0;&#x4E86;&#xFF0C;&#x201C;<code>combineReducers</code> &#x5982;&#x4F55;&#x5904;&#x7406;&#x8FD9;&#x4E9B;&#x5E94;&#x7528;&#x573A;&#x666F;&#x5462;&#xFF1F;&#x201D;&#x901A;&#x5E38;&#x7ED9;&#x51FA;&#x7684;&#x56DE;&#x7B54;&#x53EA;&#x662F;&#x201C;&#x4F60;&#x4E0D;&#x80FD;&#x8FD9;&#x4E48;&#x505A;&#xFF0C;&#x4F60;&#x53EF;&#x80FD;&#x9700;&#x8981;&#x901A;&#x8FC7;&#x5176;&#x4ED6;&#x65B9;&#x5F0F;&#x89E3;&#x51B3;&#x201D;&#x3002;<strong>&#x4E00;&#x65E6;&#x4F60;&#x7A81;&#x7834; <code>combineReducers</code> &#x7684;&#x8FD9;&#x79CD;&#x9650;&#x5236;&#xFF0C;&#x5C31;&#x662F;&#x521B;&#x5EFA;&#x5404;&#x8272;&#x5404;&#x6837;&#x7684;&#x201C;&#x81EA;&#x5B9A;&#x4E49;&#x201D; reducer &#x7684;&#x65F6;&#x5019;&#x4E86;</strong>&#xFF0C;&#x4E0D;&#x7BA1;&#x662F;&#x4E3A;&#x4E86;&#x89E3;&#x51B3;&#x4E00;&#x6B21;&#x6027;&#x573A;&#x666F;&#x7684;&#x7279;&#x6B8A; reducer&#xFF0C;&#x8FD8;&#x662F;&#x80FD;&#x591F;&#x88AB;&#x5E7F;&#x6CDB;&#x590D;&#x7528;&#x7684; reducer&#x3002;&#x672C;&#x6587;&#x4E3A;&#x51E0;&#x79CD;&#x5178;&#x578B;&#x7684;&#x5E94;&#x7528;&#x573A;&#x666F;&#x63D0;&#x4F9B;&#x4E86;&#x5EFA;&#x8BAE;&#xFF0C;&#x4F46;&#x4F60;&#x4E5F;&#x53EF;&#x4EE5;&#x81EA;&#x7531;&#x53D1;&#x6325;&#x3002;</p>
<h2 id="%E7%BB%93%E5%90%88-immutable-js-%E5%AF%B9%E8%B1%A1%E4%BD%BF%E7%94%A8-reducers">&#x7ED3;&#x5408; Immutable.js &#x5BF9;&#x8C61;&#x4F7F;&#x7528; reducers</h2>
<p>&#x7531;&#x4E8E;&#x76EE;&#x524D; <code>combineReducers</code> &#x53EA;&#x80FD;&#x5904;&#x7406;&#x666E;&#x901A;&#x7684; JavaScript &#x5BF9;&#x8C61;&#xFF0C;&#x5BF9;&#x4E8E;&#x628A; Immutable.js Map &#x5BF9;&#x8C61;&#x4F5C;&#x4E3A;&#x9876;&#x5C42; state &#x6811;&#x7684;&#x5E94;&#x7528;&#x7A0B;&#x5E8F;&#x6765;&#x8BF4;&#xFF0C;&#x53EF;&#x80FD;&#x65E0;&#x6CD5;&#x4F7F;&#x7528; <code>combineReducers</code> &#x7BA1;&#x7406;&#x5E94;&#x7528;&#x72B6;&#x6001;&#x3002;&#x56E0;&#x4E3A;&#x5F88;&#x591A;&#x5F00;&#x53D1;&#x8005;&#x91C7;&#x7528;&#x4E86; Immutable.js&#xFF0C;&#x6240;&#x4EE5;&#x6D8C;&#x73B0;&#x4E86;&#x5927;&#x91CF;&#x63D0;&#x4F9B;&#x7C7B;&#x4F3C;&#x529F;&#x80FD;&#x7684;&#x5DE5;&#x5177;&#xFF0C;&#x4F8B;&#x5982; <a href="https://github.com/gajus/redux-immutable" target="_blank">redux-immutable</a>&#x3002;&#x8FD9;&#x4E2A;&#x7B2C;&#x4E09;&#x65B9;&#x5305;&#x5B9E;&#x73B0;&#x4E86;&#x4E00;&#x4E2A;&#x80FD;&#x591F;&#x5904;&#x7406; Immutable Map &#x6570;&#x636E;&#x800C;&#x975E;&#x666E;&#x901A;&#x7684; JavaScript &#x5BF9;&#x8C61;&#x7684; <code>combineReducers</code>&#x3002;</p>
<h2 id="%E4%B8%8D%E5%90%8C-reducers-%E4%B9%8B%E9%97%B4%E5%85%B1%E4%BA%AB%E6%95%B0%E6%8D%AE">&#x4E0D;&#x540C; reducers &#x4E4B;&#x95F4;&#x5171;&#x4EAB;&#x6570;&#x636E;</h2>
<p>&#x7C7B;&#x4F3C;&#x5730;&#xFF0C;&#x5982;&#x679C; <code>sliceReducerA</code> &#x4E3A;&#x4E86;&#x5904;&#x7406;&#x7279;&#x6B8A;&#x7684; action &#x6B63;&#x597D;&#x9700;&#x8981;&#x6765;&#x81EA; <code>sliceReducerB</code> &#x7684;&#x90E8;&#x5206; state &#x6570;&#x636E;&#xFF0C;&#x6216;&#x8005; <code>sliceReducerB</code> &#x6B63;&#x597D;&#x9700;&#x8981;&#x5168;&#x90E8;&#x7684; state &#x4F5C;&#x4E3A;&#x53C2;&#x6570;&#xFF0C;&#x5355;&#x5355;&#x5C31; <code>combineReducers</code> &#x662F;&#x65E0;&#x6CD5;&#x89E3;&#x51B3;&#x8FD9;&#x79CD;&#x95EE;&#x9898;&#x7684;&#x3002;&#x53EF;&#x4EE5;&#x8FD9;&#x6837;&#x6765;&#x89E3;&#x51B3;&#xFF1A;&#x628A;&#x6240;&#x9700;&#x6570;&#x636E;&#x5F53;&#x989D;&#x5916;&#x53C2;&#x6570;&#x7684;&#x5F62;&#x5F0F;&#x4F20;&#x9012;&#x7ED9;&#x81EA;&#x5B9A;&#x4E49;&#x51FD;&#x6570;&#xFF0C;&#x4F8B;&#x5982;&#xFF1A;</p>
<pre><code class="lang-js"><span class="token keyword">function</span> <span class="token function">combinedReducer</span><span class="token punctuation">(</span>state<span class="token punctuation">,</span> action<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">switch</span><span class="token punctuation">(</span>action<span class="token punctuation">.</span>type<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">case</span> <span class="token string">&quot;A_TYPICAL_ACTION&quot;</span> <span class="token punctuation">:</span> <span class="token punctuation">{</span>
            <span class="token keyword">return</span> <span class="token punctuation">{</span>
                a <span class="token punctuation">:</span> <span class="token function">sliceReducerA</span><span class="token punctuation">(</span>state<span class="token punctuation">.</span>a<span class="token punctuation">,</span> action<span class="token punctuation">)</span><span class="token punctuation">,</span>
                b <span class="token punctuation">:</span> <span class="token function">sliceReducerB</span><span class="token punctuation">(</span>state<span class="token punctuation">.</span>b<span class="token punctuation">,</span> action<span class="token punctuation">)</span>
            <span class="token punctuation">}</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token keyword">case</span> <span class="token string">&quot;SOME_SPECIAL_ACTION&quot;</span> <span class="token punctuation">:</span> <span class="token punctuation">{</span>
            <span class="token keyword">return</span> <span class="token punctuation">{</span>
                <span class="token comment" spellcheck="true">// &#x660E;&#x786E;&#x5730;&#x628A; state.b &#x4F5C;&#x4E3A;&#x989D;&#x5916;&#x53C2;&#x6570;&#x8FDB;&#x884C;&#x4F20;&#x9012;</span>
                a <span class="token punctuation">:</span> <span class="token function">sliceReducerA</span><span class="token punctuation">(</span>state<span class="token punctuation">.</span>a<span class="token punctuation">,</span> action<span class="token punctuation">,</span> state<span class="token punctuation">.</span>b<span class="token punctuation">)</span><span class="token punctuation">,</span>
                b <span class="token punctuation">:</span> <span class="token function">sliceReducerB</span><span class="token punctuation">(</span>state<span class="token punctuation">.</span>b<span class="token punctuation">,</span> action<span class="token punctuation">)</span>
            <span class="token punctuation">}</span>        
        <span class="token punctuation">}</span>
        <span class="token keyword">case</span> <span class="token string">&quot;ANOTHER_SPECIAL_ACTION&quot;</span> <span class="token punctuation">:</span> <span class="token punctuation">{</span>
            <span class="token keyword">return</span> <span class="token punctuation">{</span>
                a <span class="token punctuation">:</span> <span class="token function">sliceReducerA</span><span class="token punctuation">(</span>state<span class="token punctuation">.</span>a<span class="token punctuation">,</span> action<span class="token punctuation">)</span><span class="token punctuation">,</span>
                <span class="token comment" spellcheck="true">// &#x660E;&#x786E;&#x5730;&#x628A;&#x5168;&#x90E8;&#x7684; state &#x4F5C;&#x4E3A;&#x989D;&#x5916;&#x53C2;&#x6570;&#x8FDB;&#x884C;&#x4F20;&#x9012;</span>
                b <span class="token punctuation">:</span> <span class="token function">sliceReducerB</span><span class="token punctuation">(</span>state<span class="token punctuation">.</span>b<span class="token punctuation">,</span> action<span class="token punctuation">,</span> state<span class="token punctuation">)</span>
            <span class="token punctuation">}</span>         
        <span class="token punctuation">}</span>    
        <span class="token keyword">default</span><span class="token punctuation">:</span> <span class="token keyword">return</span> state<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x53E6;&#x4E00;&#x79CD;&#x89E3;&#x51B3;&#x201C;&#x5171;&#x4EAB;&#x7247;&#x6BB5;&#x6570;&#x636E;&#x66F4;&#x65B0;&#x201D; (shared-slice updates) &#x95EE;&#x9898;&#x7684;&#x7B80;&#x5355;&#x65B9;&#x6CD5;&#x662F;&#xFF0C;&#x7ED9; action &#x6DFB;&#x52A0;&#x989D;&#x5916;&#x6570;&#x636E;&#x3002;&#x53EF;&#x4EE5;&#x901A;&#x8FC7; thunk &#x51FD;&#x6570;&#x6216;&#x8005;&#x7C7B;&#x4F3C;&#x7684;&#x65B9;&#x6CD5;&#x8F7B;&#x677E;&#x5B9E;&#x73B0;&#xFF0C;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-js"><span class="token keyword">function</span> <span class="token function">someSpecialActionCreator</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token punctuation">(</span>dispatch<span class="token punctuation">,</span> getState<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
        <span class="token keyword">const</span> state <span class="token operator">=</span> <span class="token function">getState</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">const</span> dataFromB <span class="token operator">=</span> <span class="token function">selectImportantDataFromB</span><span class="token punctuation">(</span>state<span class="token punctuation">)</span><span class="token punctuation">;</span>

        <span class="token function">dispatch</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
            type <span class="token punctuation">:</span> <span class="token string">&quot;SOME_SPECIAL_ACTION&quot;</span><span class="token punctuation">,</span>
            payload <span class="token punctuation">:</span> <span class="token punctuation">{</span>
                dataFromB
            <span class="token punctuation">}</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x56E0;&#x4E3A; B &#x7684;&#x6570;&#x636E;&#x5DF2;&#x7ECF;&#x5B58;&#x5728;&#x4E8E; action &#x4E2D;&#xFF0C;&#x6240;&#x4EE5;&#x5B83;&#x7684;&#x7236;&#x7EA7; reducer &#x4E0D;&#x9700;&#x8981;&#x505A;&#x4EFB;&#x4F55;&#x7279;&#x6B8A;&#x7684;&#x5904;&#x7406;&#x5C31;&#x80FD;&#x628A;&#x6570;&#x636E;&#x66B4;&#x9732;&#x7ED9; <code>sliceReducerA</code>&#x3002;</p>
<p>&#x7B2C;&#x4E09;&#x79CD;&#x65B9;&#x6CD5;&#x662F;&#xFF1A;&#x4F7F;&#x7528; <code>combineReducers</code> &#x7EC4;&#x5408; reducer &#x6765;&#x5904;&#x7406;&#x201C;&#x7B80;&#x5355;&#x201D;&#x7684;&#x573A;&#x666F;&#xFF0C;&#x6BCF;&#x4E2A; reducer &#x4F9D;&#x65E7;&#x53EA;&#x66F4;&#x65B0;&#x81EA;&#x5DF1;&#x7684;&#x6570;&#x636E;&#xFF1B;&#x540C;&#x65F6;&#x65B0;&#x52A0;&#x4E00;&#x4E2A; reducer &#x6765;&#x5904;&#x7406;&#x591A;&#x5757;&#x6570;&#x636E;&#x4EA4;&#x53C9;&#x7684;&#x201C;&#x590D;&#x6742;&#x201D;&#x573A;&#x666F;&#xFF1B;&#x6700;&#x540E;&#x5199;&#x4E00;&#x4E2A;&#x5305;&#x88F9;&#x51FD;&#x6570;&#x4F9D;&#x6B21;&#x8C03;&#x7528;&#x8FD9;&#x4E24;&#x7C7B; reducer &#x5E76;&#x5F97;&#x5230;&#x6700;&#x7EC8;&#x7ED3;&#x679C;&#xFF1A;</p>
<pre><code class="lang-js"><span class="token keyword">const</span> combinedReducer <span class="token operator">=</span> <span class="token function">combineReducers</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    a <span class="token punctuation">:</span> sliceReducerA<span class="token punctuation">,</span>
    b <span class="token punctuation">:</span> sliceReducerB
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token keyword">function</span> <span class="token function">crossSliceReducer</span><span class="token punctuation">(</span>state<span class="token punctuation">,</span> action<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">switch</span><span class="token punctuation">(</span>action<span class="token punctuation">.</span>type<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">case</span> <span class="token string">&quot;SOME_SPECIAL_ACTION&quot;</span> <span class="token punctuation">:</span> <span class="token punctuation">{</span>
            <span class="token keyword">return</span> <span class="token punctuation">{</span>
                <span class="token comment" spellcheck="true">// &#x660E;&#x786E;&#x5730;&#x628A; state.b &#x4F5C;&#x4E3A;&#x989D;&#x5916;&#x53C2;&#x6570;&#x8FDB;&#x884C;&#x4F20;&#x9012;</span>
                a <span class="token punctuation">:</span> <span class="token function">handleSpecialCaseForA</span><span class="token punctuation">(</span>state<span class="token punctuation">.</span>a<span class="token punctuation">,</span> action<span class="token punctuation">,</span> state<span class="token punctuation">.</span>b<span class="token punctuation">)</span><span class="token punctuation">,</span>
                b <span class="token punctuation">:</span> <span class="token function">sliceReducerB</span><span class="token punctuation">(</span>state<span class="token punctuation">.</span>b<span class="token punctuation">,</span> action<span class="token punctuation">)</span>
            <span class="token punctuation">}</span>        
        <span class="token punctuation">}</span>
        <span class="token keyword">default</span> <span class="token punctuation">:</span> <span class="token keyword">return</span> state<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token keyword">function</span> <span class="token function">rootReducer</span><span class="token punctuation">(</span>state<span class="token punctuation">,</span> action<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">const</span> intermediateState <span class="token operator">=</span> <span class="token function">combinedReducer</span><span class="token punctuation">(</span>state<span class="token punctuation">,</span> action<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">const</span> finalState <span class="token operator">=</span> <span class="token function">crossSliceReducer</span><span class="token punctuation">(</span>intermediateState<span class="token punctuation">,</span> action<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> finalState<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x5DF2;&#x7ECF;&#x6709;&#x4E00;&#x4E2A;&#x5E93; <a href="https://github.com/acdlite/reduce-reducers" target="_blank">reduce-reducers</a> &#x53EF;&#x4EE5;&#x7B80;&#x5316;&#x4EE5;&#x4E0A;&#x64CD;&#x4F5C;&#x6D41;&#x7A0B;&#x3002;&#x5B83;&#x63A5;&#x6536;&#x591A;&#x4E2A; reducer &#x7136;&#x540E;&#x5BF9;&#x5B83;&#x4EEC;&#x4F9D;&#x6B21;&#x6267;&#x884C; <code><span class="token function">reduce</span><span class="token punctuation">(</span><span class="token punctuation">)</span></code> &#x64CD;&#x4F5C;&#xFF0C;&#x5E76;&#x628A;&#x4EA7;&#x751F;&#x7684;&#x4E2D;&#x95F4;&#x503C;&#x4F9D;&#x6B21;&#x4F20;&#x9012;&#x7ED9;&#x4E0B;&#x4E00;&#x4E2A; reducer&#xFF1A;</p>
<pre><code class="lang-js"><span class="token comment" spellcheck="true">// &#x4E0E;&#x4E0A;&#x8FF0;&#x624B;&#x52A8;&#x7F16;&#x5199;&#x7684; `rootReducer` &#x4E00;&#x6837;</span>
<span class="token keyword">const</span> rootReducer <span class="token operator">=</span> <span class="token function">reduceReducers</span><span class="token punctuation">(</span>combinedReducers<span class="token punctuation">,</span> crossSliceReducer<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>&#x503C;&#x5F97;&#x6CE8;&#x610F;&#x7684;&#x662F;&#xFF0C;&#x5982;&#x679C;&#x4F60;&#x4F7F;&#x7528; <code>reduceReducers</code> &#x4F60;&#x5E94;&#x8BE5;&#x786E;&#x4FDD;&#x7B2C;&#x4E00;&#x4E2A; reducer &#x80FD;&#x591F;&#x5B9A;&#x4E49;&#x521D;&#x59CB;&#x72B6;&#x6001;&#x7684; state &#x6570;&#x636E;&#xFF0C;&#x56E0;&#x4E3A;&#x540E;&#x7EED;&#x7684; reducers &#x901A;&#x5E38;&#x4F1A;&#x5047;&#x5B9A; state &#x6811;&#x5DF2;&#x7ECF;&#x5B58;&#x5728;&#xFF0C;&#x4E5F;&#x5C31;&#x4E0D;&#x4F1A;&#x4E3A;&#x6B64;&#x63D0;&#x4F9B;&#x9ED8;&#x8BA4;&#x72B6;&#x6001;&#x3002;</p>
<h2 id="%E6%9B%B4%E5%A4%9A%E5%BB%BA%E8%AE%AE">&#x66F4;&#x591A;&#x5EFA;&#x8BAE;</h2>
<p>&#x518D;&#x6B21;&#x5F3A;&#x8C03;&#xFF0C;Reducer <em>&#x53EA;&#x662F;</em>&#x666E;&#x901A;&#x7684;&#x51FD;&#x6570;&#xFF0C;&#x660E;&#x786E;&#x8FD9;&#x4E00;&#x6982;&#x5FF5;&#x975E;&#x5E38;&#x91CD;&#x8981;&#x3002;<code>combineReducers</code> &#x867D;&#x7136;&#x5B9E;&#x7528;&#x4E5F;&#x53EA;&#x662F;&#x51B0;&#x5C71;&#x4E00;&#x89D2;&#x3002;&#x9664;&#x4E86;&#x7528; switch &#x8BED;&#x53E5;&#x7F16;&#x5199;&#x51FD;&#x6570;&#xFF0C;&#x8FD8;&#x53EF;&#x4EE5;&#x7528;&#x6761;&#x4EF6;&#x903B;&#x8F91;&#xFF1B;&#x51FD;&#x6570;&#x4E0D;&#x4EC5;&#x53EF;&#x4EE5;&#x5F7C;&#x6B64;&#x7EC4;&#x5408;&#xFF0C;&#x4E5F;&#x53EF;&#x4EE5;&#x8C03;&#x7528;&#x5176;&#x4ED6;&#x51FD;&#x6570;&#x3002;&#x4E5F;&#x8BB8;&#x4F60;&#x53EF;&#x80FD;&#x9700;&#x8981;&#x8FD9;&#x6837;&#x7684;&#x4E00;&#x4E2A; reducer&#xFF0C;&#x5B83;&#x65E2;&#x80FD;&#x591F;&#x91CD;&#x7F6E; state&#xFF0C;&#x4E5F;&#x80FD;&#x591F;&#x54CD;&#x5E94;&#x7279;&#x5B9A;&#x7684; action&#x3002;&#x4F60;&#x53EF;&#x4EE5;&#x8FD9;&#x6837;&#x505A;&#xFF1A;</p>
<pre><code class="lang-js"><span class="token keyword">const</span> undoableFilteredSliceA <span class="token operator">=</span> <span class="token function">compose</span><span class="token punctuation">(</span>undoReducer<span class="token punctuation">,</span> <span class="token function">filterReducer</span><span class="token punctuation">(</span><span class="token string">&quot;ACTION_1&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;ACTION_2&quot;</span><span class="token punctuation">)</span><span class="token punctuation">,</span> sliceReducerA<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> rootReducer <span class="token operator">=</span> <span class="token function">combineReducers</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    a <span class="token punctuation">:</span> undoableFilteredSliceA<span class="token punctuation">,</span>
    b <span class="token punctuation">:</span> normalSliceReducerB
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>&#x6CE8;&#x610F; <code>combineReducers</code> &#x65E0;&#x9700;&#x77E5;&#x9053;&#x4E5F;&#x4E0D;&#x5173;&#x5FC3;&#x4EFB;&#x4F55;&#x4E00;&#x4E2A;&#x8D1F;&#x8D23;&#x7BA1;&#x7406; <code>a</code> &#x6570;&#x636E;&#x7684; reducer&#x3002;&#x6240;&#x4EE5;&#x6211;&#x4EEC;&#x5E76;&#x4E0D;&#x9700;&#x8981;&#x50CF;&#x4EE5;&#x5F80;&#x4E00;&#x6837;&#x4FEE;&#x6539; <code>combineReducers</code> &#x6765;&#x5B9E;&#x73B0;&#x64A4;&#x9500;&#x529F;&#x80FD; &#x2014;&#x2014; &#x6211;&#x4EEC;&#x53EA;&#x9700;&#x628A;&#x5404;&#x79CD;&#x51FD;&#x6570;&#x7EC4;&#x5408;&#x6210;&#x4E00;&#x4E2A;&#x65B0;&#x51FD;&#x6570;&#x5373;&#x53EF;&#x3002;</p>
<p>&#x53E6;&#x5916; <code>combineReducers</code> &#x53EA;&#x662F; Redux &#x5185;&#x7F6E;&#x7684; reducer &#x5DE5;&#x5177;&#xFF0C;&#x5927;&#x91CF;&#x5F62;&#x5F0F;&#x5404;&#x5F02;&#x7684;&#x53EF;&#x590D;&#x7528;&#x7684;&#x7B2C;&#x4E09;&#x65B9; reducer &#x5DE5;&#x5177;&#x5C42;&#x51FA;&#x4E0D;&#x7A77;&#x3002;&#x5728; <a href="https://github.com/markerikson/redux-ecosystem-links" target="_blank">Redux Addons &#x76EE;&#x5F55;</a>&#x4E2D;&#x5217;&#x4E3E;&#x4E86;&#x5F88;&#x591A;&#x53EF;&#x4F9B;&#x4F7F;&#x7528;&#x7684;&#x7B2C;&#x4E09;&#x65B9;&#x5DE5;&#x5177;&#x3002;&#x4E5F;&#x8BB8;&#x8FD9;&#x4E9B;&#x5DE5;&#x5177;&#x89E3;&#x51B3;&#x4E0D;&#x4E86;&#x4F60;&#x7684;&#x5E94;&#x7528;&#x573A;&#x666F;&#xFF0C;&#x4F46;&#x4F60;&#x968F;&#x65F6;&#x90FD;&#x53EF;&#x4EE5;&#x5B9E;&#x73B0;&#x4E00;&#x4E2A;&#x80FD;&#x591F;&#x6EE1;&#x8DB3;&#x4F60;&#x9700;&#x6C42;&#x7684;&#x5DE5;&#x5177;&#x51FD;&#x6570;&#x3002;</p>

                    
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